Abstract:

The traditional operation mode of the primary circuit desalting bed in M310 pressurized water reactor(PWR) nuclear power plants poses risks such as cross-contamination between units, elevated sulfate levels, and excessive generation of radioactive solid waste. To address these issues, this study proposed and implemented three major technical optimizations. First, reducing the resin loading in the outage-specific desalting bed from 1 500 L to 500 L to achieve volume reduction. Second, separating the functions of outage and normal operation purification,with the TEP system bed exclusively purifying during outages and the RCV system bed dedicated to routine operation, thereby eliminating cross-contamination and residual pollutants. Third, adopting high-strength, radiation-resistant macroporous nuclear-grade resins to enhance resistance to degradation and minimize sulfate release. Theoretical calculations and on-site application in over 30 outages across six units demonstrated that the optimized scheme significantly improved purification efficiency, reduced radioactive waste and collective dose, and contributed substantially to chemical control and radiation protection in PWR nuclear power plants.

Key words: pressurized water reactor, planned outage, primary circuit, ion exchange resin, volume reduction

摘要：

M310压水堆核电站一回路净化除盐床的传统运行模式存在机组间交叉污染、一回路SO₄ ^2-浓度升高及放射性固废排放量大的问题。针对这些问题提出并实施了三项优化技术措施：一是将大修专用除盐床树脂装填量由1 500 L减至500 L，实现树脂减容；二是实现大修与日常净化功能分离，大修阶段由硼回收（TEP）系统除盐床专责净化，化学容积控制（RCV）系统除盐床用于日常运行净化，从源头上避免了交叉污染与污染物残留；三是选用高强度耐辐照的大孔型核级树脂，提高了树脂抗分解性能，降低了硫酸盐释放风险。通过理论计算与6台机组30余次大修的现场验证，优化方案有效提升了净化效率，显著降低了放射性固体废物和集体剂量，对压水堆核电站一回路化学控制和辐射防护具有重要意义。

关键词: 压水堆核电站, 大修, 一回路, 离子交换树脂, 减容

CLC Number: 

• TL353+.17